Question

Identify the type of above reaction.

• A. Nucleophilic aromatic substitution reaction.
• B. Nucleophilic aromatic addition reaction
• C. Electrophilic aromatic substitution reaction.
• D. Electrophilic aromatic addition reaction.

Hint:

The diazonium cation attacks the electron rich ring of phenol and replaces a ring hydrogen.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
Benzenediazonium chloride reacts with phenol in alkaline medium to give p-hydroxyazobenzene. This is called azo coupling.

Step 2: Analyse the Reaction
The diazonium cation \(\text{C}_{6}\text{H}_{5}\text{N}_{2}^{+}\) is the electrophile. It attacks the para position of the phenoxide ring.

Step 3: Compare the options
A hydrogen of the ring is replaced by the azo group, so this is electrophilic aromatic substitution. Option (C).

Final Answer:
Azo coupling is an electrophilic aromatic substitution reaction. \[ \boxed{\text{(C) }\text{Electrophilic aromatic substitution reaction.}} \]